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11-18-2003, 02:00 AM
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#1 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Big block head ID...
I think it says 8993820.
boat anchors? some one said he had the casting list and would decode...just can't remember who it was.  Yeah...I suffer from CRS. 
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11-18-2003, 02:05 AM
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#2 |
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Registered User
Join Date: Nov 2001
Location: sparks, NV
Posts: 1,141
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are you sure it's not 3993820.
3993820....71-84...oval...OPEN...454 Passenger and Trucks, 113cc chamber, Jim 
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68 short fleet with 71 front clip 2wd jaguar blue  99 chevy ext cab shrtbed z71 loaded 99 chevy swb fleetside(daily driver)  Sparks, Nevada |
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11-18-2003, 02:08 AM
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#3 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Ok...I suffer from CRS and sloppy notes.
So are these heads any good ona smaller big block...a 396/402? (still don't know which it is) |
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11-18-2003, 02:10 AM
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#4 |
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Registered User
Join Date: Nov 2001
Location: sparks, NV
Posts: 1,141
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I am not really good with big blocks so someone else would probably be better help than I would.
JIM
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68 short fleet with 71 front clip 2wd jaguar blue 99 chevy ext cab shrtbed z71 loaded 99 chevy swb fleetside(daily driver) Sparks, Nevada |
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11-18-2003, 03:07 AM
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#5 |
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Registered User
Join Date: Oct 2003
Location: Carmichael, California
Posts: 3,006
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some say the 820 heads are junk, some say they are ok. if i remember correctly, they are a smog head. they are similar to the 049 castings. the 820 heads are decent street heads. they are open chamber so on a 396/402, you won`t get much more that about 9 to 1. to get more compression from a 396/402, you need custom pistons or use high compression closed chamber pistons. you loose about 1 point of compression going from closed to open chambers.
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Anthony |
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11-18-2003, 12:10 PM
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#6 |
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Account Suspended
Join Date: Nov 2003
Location: Fort Worth, Texas
Posts: 0
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3993820 1971 402...300, 330 hp LS-3 Open 113.0cc
454...365 hp LS-5 There's better BB heads, but these will make some decent HP for a semi-mild motor. LS-5's were no slouches... |
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11-18-2003, 12:18 PM
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#7 |
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Registered truck nut
Join Date: Dec 1999
Location: Mt. Vernon, Washington, USA
Posts: 1,584
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Have you check out this site. Don't know if that's what your needing or not. http://www.mortec.com/
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MOUNT VERNON, WASH. STATE Need a part? Just PM me |
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11-18-2003, 03:10 PM
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#8 |
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Registered User
Join Date: Sep 2003
Location: Thorntown , Indiana
Posts: 231
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I looked all through Hollander and could not find that casting # ... I have to go to the machine shop this afternoon and will ask him if he knows .... jyd
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69 Chev C-10 ... painted and ready to reassemble ( for sale ) 82 Custom Deluxe ( have parts to restore ) |
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11-19-2003, 07:25 PM
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#9 |
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Live life and be happy.
Join Date: May 2003
Location: Spokane,Washington
Posts: 266
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Looked in the Production Engine Remanfactures Association book and those heads are listed in the chevy v-8 passenger section and say year 1972-68, cid 400-396, litre 6.6, bore 4.125, Description Big Block. It also lists 3969854, 3931063, and 3964290. Hope this helps.
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